But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof.
Normal roof pitch michigan.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.
Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12.
Pitches above 9 12 are very highly angled and are designated steep slope roofs.
1 to 12 1 01 6 to 12 1 12 2 to 12 1 01 8 to 12 1 20 3 to 12 1 03 12 to 12 1 42 4 to 12 1 06 15 to 12 1 60 5 to 12 1 08 18 to 12 1 80 these multipliers may also be used to convert the horizontal pro jected area to the actual roof area for sloping roofs.
The pitch of the roof is determined by the vertical rise in inches for every horizontal twelve inch length.
Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.
In snowy areas your roof should be at least 10 12 40 to allow snow to shed while the safest roof pitch in very windy areas is between 4 12 6 12 18 5 26 5.
Minimum roof pitch for shingles.
You could also opt for a pvc flat roofing membrane.
What is the minimum slope for an asphalt shingle roof.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.
There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.
A flat roof would have a 2 12 pitch while the average roof pitch would be between 4 12 and 9 12.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing.
For a gothic style the rafters must equal the span 60 while an elizabethan style requires the rafters to be longer than the span.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs.
